Global Patent Index - EP 1003052 A1

EP 1003052 A1 2000-05-24 - Underground mine surveillance system

Title (en)

Underground mine surveillance system

Title (de)

System zur Überwachung von einer untererdische Grube

Title (fr)

Système de surveillance d'une carrière souterraine

Publication

EP 1003052 A1 (FR)

Application

EP 99402844 A

Priority

FR 9814629 A

Abstract (en)

Surveillance of old subterranean workings comprises the use of an array of seismic sensors to gather information which is frequency-filtered and correlated to remove noise when detecting indicative precursors of destructive events. N acoustic or seismic sensors (Ck) are distributed in the workings. Any amplitude signals received are processed, to identify characteristic events. Signal processing includes calculation of energy content during intervals T, from which noise information B is obtained. Energy content information (E) is calculated during periods T' where T' = T/k and k exceeds unity. The energy to noise ratio (R) is calculated. This value is compared with a predetermined threshold (S). Should R exceed S, the information is stored. Preferred Features: Signal processing takes place in real time. Selective frequency filtration (P) is applied. The signal processing is undertaken for differing frequencies. Cross-correlation between delayed and superposed noise and energy signals is undertaken. Energy results are cumulated to values (H, Hi) and stored. Each sensor has two buffer memories, each connected alternately and periodically, to the sensor and the signal processing train, during the intervals cited. Each interval (or cycle) is of the same duration. The ratio between intervals T and T' is 5-15. Filter pass bands are in the range 0-300 Hz.

Abstract (fr)

L'invention concerne un système de surveillance d'une carrière souterraine (10). L'installation comprend : N capteurs acoustiques ou sismiques (Ck) disposés dans ladite carrière (10), chaque capteur délivrant un signal représentatif de l'amplitude du signal acoustique ou sismique qu'il reçoit ; et des moyens de traitement (14) des signaux délivrés par chaque capteur pour en déduire l'éventuelle survenance dans ladite carrière d'un événement caractéristique. <IMAGE>

IPC 1-7 (main, further and additional classification)

G01V 1/00

IPC 8 full level (invention and additional information)

G01V 1/00 (2006.01)

CPC (invention and additional information)

G01V 1/00 (2013.01)

Citation (search report)

Designated contracting state (EPC)

BE DE FR

EPO simple patent family

EP 1003052 A1 20000524; EP 1003052 B1 20040714; DE 69918641 D1 20040819; DE 69918641 T2 20050728; FR 2786277 A1 20000526; FR 2786277 B1 20010209

INPADOC legal status


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